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'Bliss molecule' similar to THC in cannabis found in expensive black truffles dug out by pigs - Science - News - The Independent

Even though the truffles were found to have endocannabinoid systems, they lacked the required receptors that anandamide binds to. As the fungi have no use for the chemical, it is believed that they evolved to emit the scent of it to encourage animals to eat them to help increase their numbers.